Soil and/or groundwater remediation process

• US 5,741,427 A
• Filed: 03/14/1996
• Issued: 04/21/1998
• Est. Priority Date: 03/14/1996
• Status: Expired due to Term

• Current Assignee: Anesys Corp.
• Original Assignee: Anesys Corp.
• Inventors: Greenberg, Richard S., Watts, Richard J.
• Primary Examiner(s): McCarthy, Neil
• Application Number:
  US08/615,976
• Time in Patent Office: 768 Days
• Field of Search: 210/759, 210/763, 210/747, 210/758, 502/325
• US Class Current: 210/747.8
• CPC Class Codes: B09C 1/002 involving in-situ ground water treatment
• CPC Class Codes: B09C 1/08 chemically
• CPC Class Codes: C02F 1/683 by addition of complex-forming compounds
• CPC Class Codes: C02F 1/725 by catalytic oxidation

Abstract

A method of treating contaminants in soil and/or groundwater comprising adding a source of an oxidizing agent and a reaction product complex of a ligand donor and a metal catalyst to the in situ environment and the reaction product complex employed therein.

Claims

1. A reagent for use in the treatment of contaminants in an in situ environment comprising a reaction product complex produced by the process comprising:

(a) preparing a first aqueous solution comprising an effective amount of a ligand donor selected from at least one member of the group consisting of a mixture of phosphoric acid and monopotassium phosphate, a mixture of phosphoric acid, monopotassium phosphate and sulfuric acid, and combinations thereof;

(b) preparing a second aqueous solution comprising an effective amount of a metal catalyst selected from at least one member of the group consisting of Fe (II) salts, Fe (III) salts, Fe (II) iron chelates, Fe (III) iron chelates and combinations thereof; and

(c) combining said first and second aqueous solutions at a molar ratio of said second aqueous solution to said first aqueous solution in the range of from about 0.5 to 1.5;

1.

2. The reagent of claim 1 wherein the metal catalyst is Fe (II) sulfate.

3. The reagent of claim 1 wherein the metal catalyst is Fe (II) EDTA chelate.

4. A method of treating contaminants in an in situ environment comprising

(a) preparing a first aqueous solution comprising an effective amount of a ligand donor selected from at least one member of the group consisting of a mixture of phosphoric acid and monopotassium phosphate, a mixture of phosphoric acid, monopotassium phosphate and sulfuric acid and combinations thereof;

(b) preparing a second aqueous solution comprising an effective amount of a metal catalyst selected from at least one member of the group consisting of Fe (II) salts, Fe (III) salts, Fe (II) chelates, Fe (III) chelates and combinations thereof;

(c) combining said first and second aqueous solutions at a molar ratio of said second aqueous solution to said first aqueous solution in the range of from about 0.5 to 1.5;

1; and

(d) adding said combined solutions to said in situ environment in the presence of an oxidizing agent in an amount sufficient to treat said contaminants.